Skip to main content
×
Home
    • Aa
    • Aa

Synthesis of high-strength W–Ta ultrafine-grain composites

  • R.T. Ott (a1), X.Y. Yang (a1), D.E. Guyer (a1), S. Chauhan (a2) and D.J. Sordelet (a1)...
Abstract

Bulk samples of an ultrafine-grained tungsten–tantalum composite alloy have been synthesized by consolidating mechanically milled composite powders. The grain growth during densification is limited due to the submicron-scale layering of the individual metals in the composite particles and the relatively low sintering temperature (1300 °C). The ultrafine microstructure of the high-density (∼99% theoretical density) samples leads to a high yield stress of ∼3 GPa under quasi-static uniaxial compression. A tendency for Ta-rich solid-solution formation during densification was observed, and the high-temperature phase equilibria in the composite powders were examined further using high-energy x-ray diffraction at temperatures up to 1300 °C.

Copyright
Corresponding author
a)Address all correspondence to this author. e-mail: rtott@ameslab.gov
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

1M.A. Meyers , A. Mishra D.J. Benson : Mechanical properties of nanocrystalline materials. Prog. Mater. Sci. 51, 4272006

2C.J. Youngdahl , P.G. Sanders , J.A. Eastman J.R. Weertman : Compressive yield strengths of nanocrystalline Cu and Pd. Scripta Mater. 37, 8091997

3J.E. Carsley , A. Fisher , W.W. Milligan E.C. Aifantis : Mechanical behavior of a bulk nanostructured iron alloy. Metall. Mater. Trans. A 29, 22611998

4D. Jia , K.T. Ramesh E. Ma : Effects of nanocrystalline and ultrafine grain sizes on constitutive behavior and shear bands in iron. Acta Mater. 51, 34952003

5Q. Wei , T. Jiao , S.N. Mathaudhu , E. Ma , K.T. Hartwig K.T. Ramesh : Microstructure and mechanical properties of tantalum after equal channel angular extrusion (ECAE). Mater. Sci. Eng., A 358, 2662003

6C.Z. Duan , M.J. Wang , J.Z. Pang G.H. Li : A calculation model of shear strain and strain rate within shear band in a serrated chip formed during high-speed machining. J. Mater. Proc. Technol. 178, 2742006

7N. He , T.C. Lee , W.S. Lau S.K. Chan : Assessment of deformation of a shear localized chip in high speed machining. J. Mater. Proc. Technol. 129, 1012002

8B.K. Kad , J-M. Gebert , M.T. Perez-Prado , M.E. Kassner M.A. Meyers : Ultrafine-grain-sized zirconium by dynamic deformation. Acta Mater. 54, 41112006

9G.J. Fan , G.Y. Wang , H. Choo , P.K. Liaw , Y.S. Park , B.Q. Han E.J. Lavernia : Deformation behavior of an ultrafine-grained Al-Mg alloy at different strain rates. Scripta Mater. 52, 9292005

10R. Valiev : Nanostructuring of metals by severe plastic deformation for advanced properties. Nat. Mater. 3, 5112004

11C.C. Koch : Synthesis of nanostructured materials by mechanical milling: Problems and opportunities. Nanostruct. Mater. 9, 131997

12L. Margulies , M.J. Kramer , R.W. McCallum , S. Kycia , D.R. Haeffner , J.C. Lang A.I. Goldman : New high temperature furnace for structure refinement by powder diffraction in controlled atmospheres using synchrotron radiation. Rev. Sci. Instrum. 70, 35541999

14H.J. Ryu , S.H. Hong W.H. Baek : Microstructure and mechanical properties of mechanically alloyed and solid-state sintered tungsten heavy alloys. Mater. Sci. Eng., A 291, 912000

16R.M. German E. Olevsky : Strength predictions for bulk structures fabricated from nanoscale tungsten powders. Int. J. Refract. Met. Hard Mater. 23, 772005

17R.M. German E. Olevsky : Mapping the compaction and sintering response of tungsten-based materials into the nanoscale size range. Int. J. Refract. Met. Hard Mater. 23, 2942005

18Q. Xu , R.W. Hayes E.J. Lavernia : Creep properties of ball-milled and HIPed pure tantalum. Scripta Mater. 45, 4472001

19A.D. Romig M.J. Cieslak : Interdiffusion in the Ta–W system. J. Appl. Phys. 58, 34251985

23Th.H. de Keijser , J.I. Langford , E.J. Mittemeijer A.B.P. Vogels : Use of the Voigt function in a single-line method for the analysis of x-ray-diffraction line broadening. J. Appl. Crystallogr. 15, 3081982

26U.K. Vashi , R.W. Armstrong G.E. Zima : Hardness and grain size of consolidated fine tunsten powder. Metall. Trans. 1, 17691970

27Q. Wei , H.T. Zhang , B.E. Schuster , K.T. Ramesh , R.Z. Valiev , L.J. Kecskes , R.J. Dowding , L. Magness K. Cho : Microstructure and mechanical properties of super-strong nanocrystalline tungsten processed by high-pressure torsion. Acta Mater. 54, 40792006

29Q. Wei , K.T. Ramesh , E. Ma , L.J. Kesckes , R.J. Dowding , V.U. Kazykhanov R.Z. Valiev : Plastic flow localization in bulk-tungsten with ultrafine microstructure. App. Phys. Lett. 86, 1019072005

31A.M. Lennon K.T. Ramesh : The thermoviscoplastic response of polycrystalline tungsten in compression. Mater. Sci. Eng., A 276, 92000

32Q. Wei , T. Jiao , K.T. Ramesh E. Ma : Nano-structured vanadium: processing and mechanical properties under quasi-static and dynamic compression. Scripta Mater. 50, 3592004

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords: